Leetcode-JS-Solutions

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Leetcode-JS-Solutions

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:tropical_drink: Leetcode solutions using JavaScript.

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# leetcode-js

|  #  | Title           |  Solution       | Difficulty    | Tag          |
|-----|---------------- | --------------- | ------------- |--------------|
**1** | [**Two Sum**](https://leetcode.com/problems/two-sum/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/1) |Easy|Hash Table|
**344** | [**Reverse String**](https://leetcode.com/problems/reverse-string/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/2) |Easy||
**258** | [**Add Digits**](https://leetcode.com/problems/add-digits/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/3) | E | Math |
**104** | [**Maximum Depth of Binary Tree**](https://leetcode.com/problems/maximum-depth-of-binary-tree/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/4) | E | DFS |
**226** | [**Invert Binary Tree**](https://leetcode.com/problems/invert-binary-tree/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/5) | E | Tree |
**283**| [**Move Zeroes**](https://leetcode.com/problems/move-zeroes/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/6) | E |  |
**349** | [**Intersection of Two Arrays**](https://leetcode.com/problems/intersection-of-two-arrays/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/7) | E | Binary Search / Hash Table |
**100** | [**Same Tree**](https://leetcode.com/problems/same-tree/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/8) | Easy |  DFS |
**242** | [**Valid Anagram**](https://leetcode.com/problems/valid-anagram) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/9) |  E | Hash Table |
**169** | [**Majority Element**](https://leetcode.com/problems/majority-element/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/10) | E | Divide and Conquer |
**217** | [**Contains Duplicate**](https://leetcode.com/problems/contains-duplicate/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/11) | E | Hash Table |
**350** | [**Intersection of Two Arrays II**](https://leetcode.com/problems/intersection-of-two-arrays-ii/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/12) | E | Hash Table / Binary Search |
**168** | [**Excel Sheet Column Title**](https://leetcode.com/problems/excel-sheet-column-title/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/13) | E | Math |
**206** | [**Reverse Linked List**](https://leetcode.com/problems/reverse-linked-list) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/14) | E |  |
**387** | [**First Unique Character in a String**](https://leetcode.com/problems/first-unique-character-in-a-string/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/15) | E | Hash Table / String |
**412** | [**Fizz Buzz**](https://leetcode.com/problems/fizz-buzz/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/16) | E |  |
**326** | [**Power of Three**](https://leetcode.com/problems/power-of-three/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/17) | E | Math |
**136** | [**Single Number**](https://leetcode.com/problems/single-number/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/18) | E | Hash Table |
**83** | [**Remove Duplicates from Sorted List**](https://leetcode.com/problems/remove-duplicates-from-sorted-list/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/19) | E | Linked List |
**121** | [**Best Time to Buy and Sell Stock**](https://leetcode.com/problems/best-time-to-buy-and-sell-stock/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/20) | E | DP |
**70** | [**Climbing Stairs**](https://leetcode.com/problems/climbing-stairs/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/21) | E | DP |
**263** | [**Ugly Number**](https://leetcode.com/problems/ugly-number/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/22)[:key:](https://github.com/jzhangnu/leetcode-js/issues/23) |  E | Math |
**389** | [**Find the Difference**](https://leetcode.com/problems/find-the-difference/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/24) | E | Hash Table |
**257** | [**Binary Tree Paths**](https://leetcode.com/problems/binary-tree-paths/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/25) |  |  |
**111** | [**Minimum Depth of Binary Tree**](https://leetcode.com/problems/minimum-depth-of-binary-tree/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/26) | E | Divide and Conquer / Binary Tree |
**53** | [**Maximum Subarray**](https://leetcode.com/problems/maximum-subarray/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/27) | M | Divide and Conquer / DP |
**110** | [**Balanced Binary Tree**](https://leetcode.com/problems/balanced-binary-tree/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/28) | E | DFS |
**2** | [**Add Two Numbers**](https://leetcode.com/problems/add-two-numbers/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/29) | M | Linked List |
**404** | [**Sum of Left Leaves**](https://leetcode.com/problems/sum-of-left-leaves/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/30) | E | Recursion |
**88** | [**Merge Sorted Array**](https://leetcode.com/problems/merge-sorted-array/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/31) | E | Array |
**167** | [**Two Sum II - Input array is sorted**](https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/32) | E | Array |
**49** | [**Group Anagrams**](https://leetcode.com/problems/group-anagrams/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/33) | E | Hash Table |
**229** | [**Majority Element II**](https://leetcode.com/problems/majority-element-ii/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/34) | E | Array |
**438** | [**Find All Anagrams in a String**](https://leetcode.com/problems/find-all-anagrams-in-a-string/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/35) | E | Hash Table |
**125** | [**Valid Palindrome**](https://leetcode.com/problems/valid-palindrome/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/36) | E | String |
**237** | [**Delete Node in a Linked List**](https://leetcode.com/problems/delete-node-in-a-linked-list/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/130) | E | Linked List |
**21** | [**Merge Two Sorted Lists**](https://leetcode.com/problems/merge-two-sorted-lists/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/37) | E | Linked List |
**345** | [**Reverse Vowels of a string**](https://leetcode.com/problems/reverse-vowels-of-a-string/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/38) | E | String |
**27** | [**Remove Element**](https://leetcode.com/problems/remove-element/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/39) | E | Array |
**205** | [**Isomorphic Strings**](https://leetcode.com/problems/isomorphic-strings/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/40) | E | Hash Table |
**38** | [**Count and Say**](https://leetcode.com/problems/count-and-say/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/41) | E | String |
**290** | [**Word Pattern**](https://leetcode.com/problems/word-pattern/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/42) | E | Hash Table |
**219** | [**Contains Duplicate I**](https://leetcode.com/problems/contains-duplicate-ii/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/43) | E | Hash Table |
**299** | [**Bulls and Cows**](https://leetcode.com/problems/bulls-and-cows/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/44) | E | Hash Table |
**414** | [**Third Maximum Number**](https://leetcode.com/problems/third-maximum-number/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/45) | E | Array |
**189** | [**Rotate Array**](https://leetcode.com/problems/rotate-array/) | [:key:]() | E | Array |
**118** | [**Pascal's Triangle**](https://leetcode.com/problems/pascals-triangle/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/46) | E | Array |
**165** | [**Compare Version Numbers**](https://leetcode.com/problems/compare-version-numbers/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/47) | E | Array |
**383** | [**Ransom Note**](https://leetcode.com/problems/ransom-note/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/48) | E | String |
**58** | [**Length of Last Word**](https://leetcode.com/problems/length-of-last-word/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/49) | E | String |
**20** | [**Valid Parentheses**](https://leetcode.com/problems/valid-parentheses/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/50) | E | String |
**14** | [**Longest Common Prefix**](https://leetcode.com/problems/longest-common-prefix/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/51) | E | String |
**6** | [**ZigZag Conversion**](https://leetcode.com/problems/zigzag-conversion/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/52) | E | String |
**202** | [**Happy Number**](https://leetcode.com/problems/happy-number/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/53) | E | Hash Table |
**441** | [**Arranging Coins**](https://leetcode.com/problems/arranging-coins/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/54) | E | Hash Table |
**225** | [**Implement Stack using Queues**](https://leetcode.com/problems/longest-common-prefix/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/55) | E | Stack |
**198** | [**House Robber**](https://leetcode.com/problems/house-robber/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/56) | E | DP |
**303** | [**Range Sum Query - Immutable**](https://leetcode.com/problems/range-sum-query-immutable/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/57) | E | DP |
**448** | [**Find ALL Numbers Disappeared in an Array**](https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/58) | E | DP |
**26** | [**Remove Duplicates from Sorted Array**](https://leetcode.com/problems/remove-duplicates-from-sorted-array/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/59) | E | DP |
**235** | [**Lowest Common Ancestor of a Binary Search Tree**](https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/60) | E | Tree |
**278** | [**First Bad Version**](https://leetcode.com/problems/first-bad-version/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/61) | E | Binary Search |
**392** | [**Is Subsequence**](https://leetcode.com/problems/is-subsequence/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/62) | E | Binary Search | Greedy |
**230** | [**Kth Smallest Element in a BST**](https://leetcode.com/problems/kth-smallest-element-in-a-bst/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/63) | E | Binary Search |
**9** | [**Palindrome Number**](https://leetcode.com/problems/palindrome-number/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/64) | E | |
**131** | [**Palindrome Partitioning**](https://leetcode.com/problems/palindrome-partitioning/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/65) | E | Backtracking |
**28** | [**Implement strStr()**](https://leetcode.com/problems/implement-strstr/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/66) | E | Two Pointers | String |
**515** | [**Find Largest Value in Each Tree Row**](https://leetcode.com/problems/find-largest-value-in-each-tree-row/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/131) | M | DFS |
**119** | [**Pascal's Triangle II**](https://leetcode.com/problems/pascals-triangle-ii/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/67) | E | Array |
**204** | [**Count Primes**](https://leetcode.com/problems/count-primes/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/68) | E | Hash Table |
**396** | [**Rotate Function**](https://leetcode.com/problems/rotate-function/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/69) | E | Math |
**203** | [**Remove Linked List Elements**](https://leetcode.com/problems/remove-linked-list-elements/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/70) | E | Linked List |
**19** | [**Remove Nth Node From End of List**](https://leetcode.com/problems/remove-nth-node-from-end-of-list/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/71) | E | Linked List | Two Pointers
**844** | [**Backspace String Compare**](https://leetcode.com/problems/backspace-string-compare/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/132) | E | Two Pointers
**784** | [**Letter Case Permutation**](https://leetcode.com/problems/backspace-string-compare/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/133) | E | Backtracking
**234** | [**Palindrome Linked List**](https://leetcode.com/problems/palindrome-linked-list/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/72) | E | Linked List | two pointers
**112** | [**Path Sum**](https://leetcode.com/problems/path-sum/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/73) | E | DFS
**36** | [**Valid Sudoku**](https://leetcode.com/problems/valid-sudoku/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/74) | E | Hash Table
**141** | [**Linked List Cycle**](https://leetcode.com/problems/linked-list-cycle/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/75) | E | Linked List | two pointers
**102** | [**Binary Tree Level Order Traversal**](https://leetcode.com/problems/binary-tree-level-order-traversal/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/76) | E | BFS
**24** | [**Swap Nodes in Pairs**](https://leetcode.com/problems/swap-nodes-in-pairs/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/78) | M | Linked List
**101** | [**Symmetric Tree**](https://leetcode.com/problems/symmetric-tree/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/77) | E | BFS
**459** | [**Repeated Substring Pattern**](https://leetcode.com/problems/repeated-substring-pattern/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/79) | E | String
**455** | [**Assign Cookies**](https://leetcode.com/problems/assign-cookies/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/80) | E | Greedy
**832** | [**Flipping an Image**](https://leetcode.com/problems/flipping-an-image/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/80) | E | Array
**566** | [**Reshape the Matrix**](https://leetcode.com/problems/reshape-the-matrix/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/135) | E | Array
**643** | [**Maximum Average Subarray I**](https://leetcode.com/problems/maximum-average-subarray-i/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/136) | E | Array
**674** | [**Longest Continuous Increasing Subsequence**](https://leetcode.com/problems/longest-continuous-increasing-subsequence/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/137) | E | Array
**766** | [**Toeplitz Matrix**](https://leetcode.com/problems/toeplitz-matrix/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/138) | E | Array
**867** | [**Transpose Matrix**](https://leetcode.com/problems/transpose-matrix/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/139) | E | Array
**804** | [**Unique Morse Code Words**](https://leetcode.com/problems/unique-morse-code-words/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/140) | E | String
**657** | [**Judge Route Circle**](https://leetcode.com/problems/judge-route-circle/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/141) | E | String
**696** | [**Count Binary Substrings**](https://leetcode.com/problems/count-binary-substrings/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/142) | E | String
**841** | [**Keys and Rooms**](https://leetcode.com/problems/keys-and-rooms/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/144) | M | DFS
**513** | [**Find Bottom Left Tree Value**](https://leetcode.com/problems/find-bottom-left-tree-value/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/145) | M | DFS
**515** | [**Find Largest Value in Each Tree Row**](https://leetcode.com/problems/find-largest-value-in-each-tree-row/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/146) | M | DFS
**337** | [**House Robber III**](https://leetcode.com/problems/house-robber-iii/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/147) | M | DFS
**739** | [**Daily Temperatures**](https://leetcode.com/problems/daily-temperatures/solution/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/148) | M | Hash Table
**508** | [**Most Frequent Subtree Sum**](https://leetcode.com/problems/most-frequent-subtree-sum/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/149) | M | Hash Table
**554** | [**Brick Wall**](https://leetcode.com/problems/brick-wall/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/150) | M | Hash Table
**648** | [**Replace Words**](https://leetcode.com/problems/replace-words/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/151) | M | Hash Table
**692** | [**Top K Frequent Words**](https://leetcode.com/problems/top-k-frequent-words/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/152) | M | Hash Table
**200** | [**Number of Islands**](https://leetcode.com/problems/number-of-islands/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/153) | M | Hash Table
**694** | [**Number of distinct Islands**](https://leetcode.com/problems/number-of-distinct-islands/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/154) | M | Hash Table
**347** | [**Top K Frequent Elements**](https://leetcode.com/problems/top-k-frequent-elements/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/83) | M | Hash TableGroup Shifted String
**249** | [**Group Shifted String**](https://leetcode.com/problems/group-shifted-string/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/155) | M | Hash TableGroup Shifted String
**876** | [**Middle of the Linked List**](https://leetcode.com/problems/middle-of-the-linked-list/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/156) | E | Linked List
**238** | [**Product of Array Except Self**](https://leetcode.com/problems/product-of-array-except-self/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/82) | M | Array
**260** | [**Single Number III**](https://leetcode.com/problems/problems/single-number-iii/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/81) | M | Array
**724** | [**Find Pivot Index**](https://leetcode.com/problems/find-pivot-index/description/) | [:key:](https://github.com/jzhangnu/leetcode-js/issues/157) | M | Array

Nov 30

M[406. Queue Reconstruction by Height](https://leetcode.com/problems/queue-reconstruction-by-height/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/84)&nbsp;&nbsp;&nbsp;&nbsp;
Greedy

M[268. Missing Number](https://leetcode.com/problems/missing-number/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/85)&nbsp;&nbsp;&nbsp;&nbsp;
Array | Bit

Dec 1

M[46. Permutations](https://leetcode.com/problems/permutations/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/86)&nbsp;&nbsp;&nbsp;&nbsp;
Backtracking | Recursion

M[78. Subsets](https://leetcode.com/problems/subsets/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/87)&nbsp;&nbsp;&nbsp;&nbsp;
Backtracking | Recursion

Dec 4

M[137. Single Number II](https://leetcode.com/problems/single-number-ii/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/88)&nbsp;&nbsp;&nbsp;&nbsp;
Bit manipulation

Dec 25

[266. Palindrome Permutation](https://leetcode.com/problems/palindrome-permutation/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/89)&nbsp;&nbsp;&nbsp;&nbsp;
Hash Table

[463. Island Perimeter](https://leetcode.com/problems/island-perimeter/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/90)&nbsp;&nbsp;&nbsp;&nbsp;
DFS

[339. Nested List Weight Sum](https://leetcode.com/problems/nested-list-weight-sum/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/91)&nbsp;&nbsp;&nbsp;&nbsp;
Recursion

[243. Shortest Word Distance](https://leetcode.com/problems/shortest-word-distance/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/92)&nbsp;&nbsp;&nbsp;&nbsp;
Array

M[244. Shortest Word Distance II](https://leetcode.com/problems/shortest-word-distance-ii/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/93)&nbsp;&nbsp;&nbsp;&nbsp;
Array

M[245. Shortest Word Distance III](https://leetcode.com/problems/shortest-word-distance-iii/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/94)&nbsp;&nbsp;&nbsp;&nbsp;
Array

Jan 4

[293. Flip Game](https://leetcode.com/problems/flip-game/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/95)&nbsp;&nbsp;&nbsp;&nbsp;
Hash Table

M[294. Flip Game II](https://leetcode.com/problems/flip-game-ii/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/96)&nbsp;&nbsp;&nbsp;&nbsp;

M[17. Letter Combinations of a Phone Number](https://leetcode.com/problems/letter-combinations-of-a-phone-number/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/97)&nbsp;&nbsp;&nbsp;&nbsp;

Jan 5

[80. Remove Duplicates from Sorted Array II](https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/98)&nbsp;&nbsp;&nbsp;&nbsp;
Two pointers

[11. Container With Most Water](https://leetcode.com/problems/container-with-most-water/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/99)&nbsp;&nbsp;&nbsp;&nbsp;
Two pointers

Jan 8

[151. Reverse Words in a String](https://leetcode.com/problems/reverse-words-in-a-string/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/100)&nbsp;&nbsp;&nbsp;&nbsp;
String

[3. Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/)&nbsp;&nbsp;&nbsp;
[Solutions](https://github.com/jzhangnu/leetcode-js/issues/101)&nbsp;&nbsp;&nbsp;&nbsp;
HashMap | Two Pointers

Jan 10

?[408. Valid Word Abbreviation](https://leetcode.com/problems/valid-word-abbreviation/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/102)&nbsp;&nbsp;&nbsp;&nbsp;
++ &nbsp;&nbsp;&nbsp;&nbsp; String

[5. Longest Palindromic Substring](https://leetcode.com/problems/longest-palindromic-substring/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/103)&nbsp;&nbsp;&nbsp;&nbsp;
++++ &nbsp;&nbsp;&nbsp;&nbsp; String

Jan 11

[346. Moving Average from Data Stream](https://leetcode.com/problems/moving-average-from-data-stream/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/104)&nbsp;&nbsp;&nbsp;&nbsp;
++ &nbsp;&nbsp;&nbsp;&nbsp; Desgin

[160. Intersection of Two Linked Lists](https://leetcode.com/problems/intersection-of-two-linked-lists/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/105)&nbsp;&nbsp;&nbsp;&nbsp;
++ &nbsp;&nbsp;&nbsp;&nbsp; Linked List

[152. Maximum Product Subarray](https://leetcode.com/problems/maximum-product-subarray/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/106)&nbsp;&nbsp;&nbsp;&nbsp;
M +++ &nbsp;&nbsp;&nbsp;&nbsp; Array

Jan 12

[171. Excel Sheet Column Number](https://leetcode.com/problems/excel-sheet-column-number/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/107)&nbsp;&nbsp;&nbsp;&nbsp;
++ &nbsp;&nbsp;&nbsp;&nbsp; Math

Jan 14

[371. Sum of Two Integers](https://leetcode.com/problems/sum-of-two-integers/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/108)&nbsp;&nbsp;&nbsp;&nbsp;
++ &nbsp;&nbsp;&nbsp;&nbsp; Bit

Jan 18

[67. Add Binary](https://leetcode.com/problems/add-binary/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/109)&nbsp;&nbsp;&nbsp;&nbsp;
++ &nbsp;&nbsp;&nbsp;&nbsp; Math String

[186. Reverse Words in a String II](https://leetcode.com/problems/reverse-words-in-a-string-ii/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/110)&nbsp;&nbsp;&nbsp;&nbsp;
+++ &nbsp;&nbsp;&nbsp;&nbsp; String

Jan 24

[66. Plus One](https://leetcode.com/problems/plus-one/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/111)&nbsp;&nbsp;&nbsp;&nbsp;
+++ &nbsp;&nbsp;&nbsp;&nbsp; Array

M[79. Word Search](https://leetcode.com/problems/word-search/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/112)&nbsp;&nbsp;&nbsp;&nbsp;
+++ &nbsp;&nbsp;&nbsp;&nbsp; Array

Jan 25

[54. Spiral Matrix](https://leetcode.com/problems/spiral-matrix/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/112)&nbsp;&nbsp;&nbsp;&nbsp;
+++++ &nbsp;&nbsp;&nbsp;&nbsp; Array

[434. Number of Segments in a String](https://leetcode.com/problems/number-of-segments-in-a-string/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/113)&nbsp;&nbsp;&nbsp;&nbsp;
+++ &nbsp;&nbsp;&nbsp;&nbsp; String

[35. Search Insert Position](https://leetcode.com/problems/search-insert-position/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/114)&nbsp;&nbsp;&nbsp;&nbsp;
+++ &nbsp;&nbsp;&nbsp;&nbsp; Array Binary Search

[215. Kth Largest Element in an Array](https://leetcode.com/problems/search-insert-position/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/115)&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp; Array Binary Search

[215. Kth Largest Element in an Array](https://leetcode.com/problems/search-insert-position/)&nbsp;&nbsp;&nbsp;

[Solutions](https://github.com/jzhangnu/leetcode-js/issues/115)&nbsp;&nbsp;&nbsp;&nbsp;
+++ &nbsp;&nbsp;&nbsp;&nbsp; Array Binary Search

Feb 17

[506. Relative Ranks](https://leetcode.com/problems/relative-ranks/)&nbsp;&nbsp;&nbsp;
++ &nbsp;&nbsp;&nbsp;&nbsp; Hashmap

[508. Most Frequent Subtree Sum](https://leetcode.com/problems/most-frequent-subtree-sum/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/118)&nbsp;&nbsp;&nbsp;
M &nbsp;&nbsp;&nbsp; Hashmap

[687. Longest Univalue Path](https://leetcode.com/problems/longest-univalue-path/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/119)&nbsp;&nbsp;&nbsp;
M &nbsp;&nbsp;&nbsp; Hashmap

[647. Palindromic Substrings](https://leetcode.com/problems/palindromic-substrings/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/120)&nbsp;&nbsp;&nbsp;
M &nbsp;&nbsp;&nbsp; String

[594. Longest Harmonious Subsequence](https://leetcode.com/problems/longest-harmonious-subsequence/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/121)&nbsp;&nbsp;&nbsp;
E &nbsp;&nbsp;&nbsp; HashMap

[771. Jewels and Stones](https://leetcode.com/problems/jewels-and-stones/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/122)&nbsp;&nbsp;&nbsp;
E &nbsp;&nbsp;&nbsp; HashMap

[451. Sort Characters By Frequency](https://leetcode.com/problems/sort-characters-by-frequency/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/123)&nbsp;&nbsp;&nbsp;
M &nbsp;&nbsp;&nbsp; HashMap

[435. Non-overlapping Intervals](https://leetcode.com/problems/non-overlapping-intervals/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/124)&nbsp;&nbsp;&nbsp;
M &nbsp;&nbsp;&nbsp; Greedy

[560. Subarray Sum Equals K](https://leetcode.com/problems/subarray-sum-equals-k/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/125)&nbsp;&nbsp;&nbsp;
M &nbsp;&nbsp;&nbsp; hashTable

[557. Reverse Words in a String III](https://leetcode.com/problems/reverse-words-in-a-string-iii/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/126)&nbsp;&nbsp;&nbsp;
M &nbsp;&nbsp;&nbsp; hashTable

[442. Find All Duplicates in an Array](https://leetcode.com/problems/find-all-duplicates-in-an-array/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/127)&nbsp;&nbsp;&nbsp;
M &nbsp;&nbsp;&nbsp; array

[695. Max Area of Island](https://leetcode.com/problems/max-area-of-island/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/128)&nbsp;&nbsp;&nbsp;
E &nbsp;&nbsp;&nbsp; DFS

[581. Shortest Unsorted Continuous Subarray](https://leetcode.com/problems/shortest-unsorted-continuous-subarray/description/)&nbsp;&nbsp;&nbsp;
[solutions](https://github.com/jzhangnu/Leetcode-JS-Solutions/issues/129)&nbsp;&nbsp;&nbsp;
E &nbsp;&nbsp;&nbsp; Array

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